Portland Cement
Definition
Portland cement is obtained by burning a mixture of lime and clay to form a clinker that is pulverized into powder. The gray powder is composed primarily of calcium ferrites, calcium silicates, and calcium aluminates. When mixed with water, it solidifies to an artificial rock, similar to Portland stone which is a yellow limestone from the Isle of Portland, in Great Britain.
Typical Composition
| Element | Typical Content |
| SiO2 | 20-21% |
| Al2O3 | 5.12% |
| Fe2O3 | 3.62% |
| CaO | 64-66% |
| MgO | 0.80% |
| SO3 | 2.42% |
| Na2O | 0.18% |
| K2O | 0.68% |
| CI | 0.0020% |
| LOI | 2.98% |
